Today's Message Index:
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1. 05:41 AM - Re: Voltmeter Needs Independent Power Supply (rampil)
2. 07:39 AM - Speedbrakes (Dennis Johnson)
3. 10:29 AM - Re: Audio system design (Radioflyer)
4. 10:50 AM - Ground Power and Aux Alt sharing OVM? (jonlaury)
Message 1
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| Subject: | Re: Voltmeter Needs Independent Power Supply |
It would almost certainly work fine to tie the grounds together and the
+12 supply and the +measurement together.
--------
Ira N224XS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=302792#302792
Message 2
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My Lancair Legacy has Precise Flight speedbrakes. But are they spoilers
or speedbrakes?
The primary purpose of a spoiler is to kill the lift on top of the wing.
Typically, they are relatively long and narrow. Long to cover a
significant portion of the wing and narrow because for the purpose of
killing lift, they don't need to be very wide.
The primary purpose of a speedbrake is to slow the airplane by acting as
a flat plate drag device.
The Precise Flight speedbrakes on a Legacy (and some other designs) are
installed on the top of the wing. That makes them neither fish nor
fowl. Since they are on top of the wing, they kill lift along the span
of the wing equal to at least their width, and therefore, act as
spoilers.
However, their shape makes them inefficient as spoilers. Their flat
plate area is nearly square (they are as tall as they are wide), which
means for a spoiler, they are much taller than needed and cover too
short of the span of the wing. So in that regard, they are speedbrakes.
As a practical matter, Precise Flight speedbrakes are both spoilers and
speedbrakes. We know that parasite drag increases as the square of
airspeed. This means that at high airspeed, the effect of the
speedbrakes on parasite drag is hugely more than at low speed.
Deploying them at high speed generates a large amount of parasite drag.
At low speed, the drag effect is relatively small while the spoiler
effect is large.
They act more like speedbrakes at high speed and more like spoilers at
low speed. Since I typically only use mine at high speed to slow down,
for me, they are speedbrakes. I don't normally use them at low speed
because those stubby little wings need all the lift they can get when
flying slowly.
By the way, I rarely use my speedbrakes. I feel like deploying them is
an admission that I used poor planning and am just wasting gas.
However, there are times when it makes life so much easier. There are a
few mountain airports I visit where for safety it's nice to come in high
over a ridge and drop down quickly to pattern altitude before entering
downwind. And there are times on IFR flights when approach control
keeps me high until the last minute.
Dennis
Message 3
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| Subject: | Re: Audio system design |
yes, that's the one. 817.439.4645
-Jose
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=302854#302854
Message 4
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| Subject: | Ground Power and Aux Alt sharing OVM? |
I'm using Z13 in conjunction with Z31-B. Is there anything wrong about the aux
alternator and the ground power jack sharing the same OVM? The only condition
that I can think of where both systems would be in use simultaneously is a ground
powered START on the aux alternator and that may not even be an issue unless
the OVM tripped. The issue being what caused it, the GPU or the aux alt.
If this passes group muster, how would I wire it?
Thanks,
John
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=302859#302859
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